Electric panel resistive element water heating

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Re: Electric panel resistive element water heating

Postby 34by151 » Wed Jul 27, 2016 5:36 am

Id like to see inside the box, suspect its just a contractor with a 12vdc coil

Cheers
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Re: Electric panel resistive element water heating

Postby australsolarier » Wed Jul 27, 2016 6:18 am

34by151,
i am sure you mean it has a "contactor" inside.
anybody know how many 100reds of dollars the box cost?
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Re: Electric panel resistive element water heating

Postby australsolarier » Wed Jul 27, 2016 6:39 am

answering my own question:
$1,228.00 for the 20A one, the 10A slightly less.

i suppose for that kind of money you can buy 5x250watt panels. again i myself would think i would be better off investing in panels rather than in the switch.
the idea of the switch is good though. might be way cheaper having two dc breakers doing the switching manually
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Re: Electric panel resistive element water heating

Postby APR » Wed Jul 27, 2016 6:49 am

australsolarier wrote:i am sure you mean it has a "contactor" inside.
i am sure there are some people who would like to put their solar contractor in a box just like that one. 8-)

anybody know how many 100reds of dollars the box cost?

I am going to enquire today for the 20 amp unit, and will post back.

I have got a reply on pricing for the HotPV inverter which is evidently an inverter that is reengineered to specifically drive heating elements....

"The pricing of the inverters are:"

"3kW inverter supply only: $2700 plus GST; this inverter has a max input DC
voltage of 600V DC "

"3.8kW inverter supply only: $2600 plus GST; this inverter has a max input DC
voltage of 500V DC"

"The inverters come with integral DC isolators so it means you do not need
to add a DC isolator to the input of the inverter, and save labour and
hardware cost."

"With regards pricing, the reason for asking for your postcode is to see what
level of STCs your location would give you, as well as whether we have any
installers in the area. Did you get someone else to install the array today
(does it qualify for STCs)? If you do overclock the inverter, all of the
solar panels remain eligible to claim STCs – off-grid arrays do not have the
same limits on the ratio of the rating of panels to the rating of inverters,
for STC claims."

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Re: Electric panel resistive element water heating

Postby australsolarier » Wed Jul 27, 2016 6:58 am

solar contractor:
yes at least keep them captured on the property until such time as they finish started work.
hehehe
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Re: Electric panel resistive element water heating

Postby APR » Wed Jul 27, 2016 7:06 am

australsolarier wrote:answering my own question:
$1,228.00 for the 20A one, the 10A slightly less.

Well that rules that device out. This project of mine is already at that cost point whereby I will have to live to 104 and shower 3 times daily to be able to justify it.
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Re: Electric panel resistive element water heating

Postby 34by151 » Wed Jul 27, 2016 4:02 pm

australsolarier wrote:34by151,
i am sure you mean it has a "contactor" inside.


Yes I did, aren't spell checks wonderful
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Re: Electric panel resistive element water heating

Postby davidg » Wed Jul 27, 2016 6:19 pm

APR wrote:Now that is interesting. Thanks for the link.


Got a nice price tag too for the 20A version over $1000 for it.

I have made a changeover relay system up in the past that would have done this for another project a couple of years ago. It had to change an array of panels from all in series to half combined with the other half paralleled, that took a bunch of wiring and a bunch of high voltage DC relays.

This would be simpler to do, if a relay or relays did not have enough current carrying capacity then simply parallel more of them together (within reason) to get the desired current carrying capacity.
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Re: Electric panel resistive element water heating

Postby new to solar power » Wed Jul 27, 2016 7:34 pm

These are great ideas but I just flick the hot water switch on the wall inside the house when I see blue skies
I work on the kiss theory.
I have hot water solar panels on the roof and have found best results to heat the water from the inverter early in the morning :lol: :mrgreen:
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Re: Electric panel resistive element water heating

Postby APR » Sun Jul 31, 2016 8:38 am

http://solidstaterelaystore.com/pe9030.aspx
new to solar power wrote:These are great ideas but I just flick the hot water switch on the wall inside the house when I see blue skies

I have the option to do the same, but as I am not always at home and there are others in the house, I am looking at automating the process without using the grid. To do so I need more panel power.

I had the 10 X 250 watt panels installed on the northern roof as 2 strings of 5 panels with Isolation on the roof as well as in the garage for each string. I can connect to the termination to have the 2 strings of panels in parallel, or I can series them to give one string of 10 panels. The strings were installed by a local solar installer.

I am currently considering paralleling my original 2 strings of panels into one MPPT and connecting this new string of 10 panels into the second MPPT on my inverter. I may then use a a 900v 30a DC-DC SSR to automatically disconnect one of the paralleled strings when insolation is high and the combined amperage of the paralleled strings would exceed the DC input rating of the MPPT.

http://solidstaterelaystore.com/pe9030.aspx
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